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Teilenummer | LR34063D |
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Beschreibung | DC-DC Converter Control Circuits | |
Hersteller | LRC | |
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Gesamt 12 Seiten LESHAN RADIO COMPANY, LTD.
DC-DC Converter
Control Circuits
LR34063
DESCRIPTION:
The LR34063 Series is a monolithic control circuit containing
the primary functions required for DC-to-DC converters.These
devices consist of an internal temperature compensated refe-
rence,comparator, controlled duty cycle oscillator with an active
current limit circuit, driver and high current output switch.This
series was specifically designed to be incorporated in Step-Down
and Step-Up and Voltage-Inverting applications with a minimum
number of external components.
DIP-8
FEATURE:
z Operation from 3.0 V to 40 V Input
z Low Standby Current
z Current Limiting
z Output Switch Current to 1.5 A
z Output Voltage Adjustable
z Frequency Operation to 100 kHz
z Precision 2% Reference
SOP-8
ORDERING INFORMATION
Device
LR34063
LR34063D
Package
DIP-8
SOP-8
BLOCK DIAGRAM
Drive 8
Collector
Ipk 7
Sense
6
VCC
Comparator 5
Inverting
Input
S Q Q2
R
100
Q1
Ipk
Oscillator
CT
Comparator
+ 1.25 V
Reference
– Regulator
1
Switch
Collector
2 Switch
Emitter
3 Timing
Capacitor
4
Gnd
(Bottom View)
PIN CONNECTIONS
Switch
Collector
Switch
Emitter
1
2
Timing 3
Capacitor
Gnd 4
8
Driver
Collector
7 Ipk Sense
(Top View)
6 VCC
Comparator
5 Inverting
Input
LR34063-1/12
8
7
Rsc
Vin 6
LESHAN RADIO COMPANY, LTD.
LR34063
1 Vout 8
7
2
Rsc
Vin 6
R
1
Vout
2
R ³ 0 for
constant Vin
Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A
8a. External NPN Switch
8b. External NPN Saturated Switch
(See Note 6)
6. If the output switch is driven into hard saturation (non−Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents
(≥ 30 mA), it may take up to 2.0 ms to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is magnified
at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a
non−Darlington configuration is used, the following output drive condition is recommended.
LR34063-6/12
6 Page LESHAN RADIO COMPANY, LTD.
Mechanical Dimensions (Continued)
DIP-8
LR34063
Unit: mm
f
f
e
e e
f
e e
¶hf
0,1
f
0$;
5
LR34063-12/12
12 Page | ||
Seiten | Gesamt 12 Seiten | |
PDF Download | [ LR34063D Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
LR34063 | DC-DC Converter Control Circuits | LRC |
LR34063D | DC-DC Converter Control Circuits | LRC |
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